Another approach was proposed by [1]}: they compared the \(K-\) band absolute magnitudes of BCGs in regular clusters and FGs, finding that the latter are systematically fainter. The author concluded that FG progenitors are likely poor groups. Moreover, it is interesting to note that [2]} studied “the properties of Hickson's compact groups and of the Loose Groups within which they are Embedded”. In this work, no link with FGs is suggested, but the result could be seen under a different light after the [1]} study, confirming the idea that poor compact groups could be the ideal progenitors of FGs. However, this result apparently collides with what was presented in Sect. REF , where we cited various studies claiming that BCGs in FGs are amongst the most-massive galaxies in the Universe. On the other hand, [4]} analysed the mass assembly histories fo compact and fossil systems in the Millennium simulation and associated semi-analytical models. They found that only 30% of FGs could originated from compact groups. They conclude that most of the fossil and compact groups follow different evolutionary paths.
